RANDOM: Random number generation

Block RANDOM (FB426) supplies a random output signal. The sequence of the new values can be determined: at random or constant. The value range of the output signal can be limited.

Application

The block allows for the following applications:

• Generate a random number of pulses e.g. for random switch-on or switch-off of any functions or aggregates.
• Generate a random number for further use.

Functionality

Block RANDOM generates a real value output signal [Out] and a binary output signal [Imp].

The real values of [Out] are distributed at random across the value range [OutMin], [OutMax].

The output values of [Out] and [Imp] are issued at random intervals between [TiMin], [TiMax] or at constant intervals (e.g. every 10 seconds).

Example1: Random number [Out] at intervals between [TiMin] and [TiMax].

If [TiMin] < [TiMax], then a new random number [Out] is issued at the earliest after [TiMin] and at the latest after [TiMax].

A new pulse [Imp] is issued at the same time. Each pulse lasts one program cycle.

Example 2: Random number [Out] in each program cycle.

If [TiMin] = [TiMax] = 0, then a new random number [Out] is issued in each program cycle.

The binary output signal [Imp] is constant: [Imp] = 1.

Example 3: Random number [Out] at constant intervals.

If [TiMin] = [TiMax] = x, then a new random number [Out] is always issued after time x.

A new pulse [Imp] is issued at the same time. Each pulse lasts one program cycle.

(Prerequisite: x <> 0)

Inputs

Outputs

Input values

Output values

Process response

Standard (see General rules and information).

Troubleshooting

Standard (see General rules and information).